Welcome to CHR!
Great advice from Tech (as usual). Central Cylinder Head Services are in Portland and have been in business since 1969. They perform soup-to-nuts and and they know heads.

Services

Phone number for the machine shop is: (503) 233-8262

I like Tech's approach - call them and let them know what you're up to and they probably have exactly what you are looking for. The shipping from Portland to K-Falls wold not be too bad and you'd have your heads in a couple days.

Let us know what you decide.

Regards,
Glenn